web config - DbProviderFactories for .NET Error -

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i having trouble getting odp.net library work .net dbproviderfactories. getting following error code:

_dbfactory = dbproviderfactories.getfactory(providername);

an error occurred creating configuration section handler system.data: column 'invariantname' constrained unique. value 'oracle.dataaccess.client' present.

with providername: oracle.dataaccess.client

and following entry in web.config:

  <system.data>     <dbproviderfactories>       <add name="oracle data provider .net" invariant="oracle.dataaccess.client" description=".net framework data provider oracle" type="oracle.dataaccess.client.oracleclientfactory, oracle.dataaccess, version=10.2.0.100, culture=neutral, publickeytoken=89b483f429c47342" />     </dbproviderfactories>   </system.data>

does know wrong? don't think have set twice anywhere.

if installed odp.net (eg using oracle universal installer, opposed xcopy), you'll find same dbproviderfactories/add in machine.config.

so adding in web.config adding second time - so, duplicate oracle.dataaccess.client!


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